mirror of https://github.com/FFmpeg/FFmpeg.git
Only I-frames are decoded for now. Signed-off-by: Diego Biurrun <diego@biurrun.de>pull/272/head
Kostya Shishkov
8 years ago
committed by
Diego Biurrun
parent
c55f2ae2b8
commit
189157c3fc
10 changed files with 408 additions and 1 deletions
@ -0,0 +1,391 @@ |
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/*
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* ClearVideo decoder |
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* Copyright (c) 2012 Konstantin Shishkov |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* ClearVideo decoder |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "get_bits.h" |
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#include "idctdsp.h" |
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#include "internal.h" |
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#define NUM_DC_CODES 127 |
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#define NUM_AC_CODES 103 |
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static const uint8_t clv_dc_codes[NUM_DC_CODES] = { |
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, |
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0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x07, 0x0B, |
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0x0C, 0x08, 0x08, 0x09, 0x04, 0x06, 0x07, 0x05, |
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0x04, 0x05, 0x04, 0x06, 0x05, 0x06, 0x07, 0x05, |
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0x06, 0x07, 0x06, 0x07, 0x08, 0x06, 0x07, 0x08, |
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0x09, 0x0A, 0x0B, 0x07, 0x08, 0x09, 0x07, 0x08, |
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0x06, 0x07, 0x08, 0x06, 0x04, 0x05, 0x02, 0x01, |
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0x03, 0x06, 0x07, 0x07, 0x09, 0x0A, 0x0B, 0x09, |
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0x0A, 0x0B, 0x0A, 0x0B, 0x0C, 0x0D, 0x0C, 0x09, |
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0x0D, 0x0A, 0x0B, 0x08, 0x09, 0x0A, 0x0B, 0x07, |
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0x08, 0x09, 0x0A, 0x0B, 0x06, 0x07, 0x06, 0x08, |
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0x07, 0x09, 0x0A, 0x0B, 0x09, 0x0A, 0x0B, 0x0C, |
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0x14, 0x0D, 0x0D, 0x0E, 0x0F, 0x15, 0x15, 0x16, |
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0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, |
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0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, |
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}; |
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static const uint8_t clv_dc_bits[NUM_DC_CODES] = { |
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22, 22, 22, 22, 22, 22, 22, 22, |
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22, 22, 22, 22, 22, 22, 22, 22, |
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22, 22, 22, 21, 22, 22, 19, 20, |
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20, 19, 18, 18, 15, 17, 17, 16, |
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14, 15, 12, 13, 14, 14, 14, 12, |
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12, 12, 11, 11, 11, 10, 10, 10, |
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10, 10, 10, 9, 9, 9, 8, 8, |
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7, 7, 7, 6, 5, 5, 3, 1, |
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3, 5, 5, 6, 7, 7, 7, 8, |
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8, 8, 9, 9, 9, 9, 10, 11, |
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10, 11, 11, 12, 12, 12, 12, 13, |
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14, 14, 14, 14, 15, 15, 16, 17, |
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16, 17, 18, 18, 19, 19, 19, 19, |
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21, 19, 20, 19, 19, 21, 22, 22, |
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22, 22, 22, 22, 22, 22, 22, 22, |
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22, 22, 22, 22, 22, 22, 22, |
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}; |
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static const uint16_t clv_ac_syms[NUM_AC_CODES] = { |
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0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, |
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0x0009, 0x000A, 0x000B, 0x000C, 0x0011, 0x0012, 0x0013, 0x0014, |
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0x0015, 0x0016, 0x0021, 0x0022, 0x0023, 0x0024, 0x0031, 0x0032, |
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0x0033, 0x0041, 0x0042, 0x0043, 0x0051, 0x0052, 0x0053, 0x0061, |
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0x0062, 0x0063, 0x0071, 0x0072, 0x0081, 0x0082, 0x0091, 0x0092, |
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0x00A1, 0x00A2, 0x00B1, 0x00C1, 0x00D1, 0x00E1, 0x00F1, 0x0101, |
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0x0111, 0x0121, 0x0131, 0x0141, 0x0151, 0x0161, 0x0171, 0x0181, |
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0x0191, 0x01A1, 0x1001, 0x1002, 0x1003, 0x1011, 0x1012, 0x1021, |
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0x1031, 0x1041, 0x1051, 0x1061, 0x1071, 0x1081, 0x1091, 0x10A1, |
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0x10B1, 0x10C1, 0x10D1, 0x10E1, 0x10F1, 0x1101, 0x1111, 0x1121, |
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0x1131, 0x1141, 0x1151, 0x1161, 0x1171, 0x1181, 0x1191, 0x11A1, |
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0x11B1, 0x11C1, 0x11D1, 0x11E1, 0x11F1, 0x1201, 0x1211, 0x1221, |
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0x1231, 0x1241, 0x1251, 0x1261, 0x1271, 0x1281, 0x1BFF, |
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}; |
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static const uint8_t clv_ac_codes[NUM_AC_CODES] = { |
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0x02, 0x0F, 0x15, 0x17, 0x1F, 0x25, 0x24, 0x21, |
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0x20, 0x07, 0x06, 0x20, 0x06, 0x14, 0x1E, 0x0F, |
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0x21, 0x50, 0x0E, 0x1D, 0x0E, 0x51, 0x0D, 0x23, |
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0x0D, 0x0C, 0x22, 0x52, 0x0B, 0x0C, 0x53, 0x13, |
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0x0B, 0x54, 0x12, 0x0A, 0x11, 0x09, 0x10, 0x08, |
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0x16, 0x55, 0x15, 0x14, 0x1C, 0x1B, 0x21, 0x20, |
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0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x22, 0x23, |
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0x56, 0x57, 0x07, 0x19, 0x05, 0x0F, 0x04, 0x0E, |
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0x0D, 0x0C, 0x13, 0x12, 0x11, 0x10, 0x1A, 0x19, |
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0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x18, 0x17, |
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0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x07, 0x06, |
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0x05, 0x04, 0x24, 0x25, 0x26, 0x27, 0x58, 0x59, |
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0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x03, |
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}; |
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static const uint8_t clv_ac_bits[NUM_AC_CODES] = { |
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2, 4, 6, 7, 8, 9, 9, 10, |
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10, 11, 11, 11, 3, 6, 8, 10, |
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11, 12, 4, 8, 10, 12, 5, 9, |
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10, 5, 9, 12, 5, 10, 12, 6, |
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10, 12, 6, 10, 6, 10, 6, 10, |
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7, 12, 7, 7, 8, 8, 9, 9, |
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9, 9, 9, 9, 9, 9, 11, 11, |
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12, 12, 4, 9, 11, 6, 11, 6, |
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6, 6, 7, 7, 7, 7, 8, 8, |
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8, 8, 8, 8, 8, 8, 9, 9, |
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9, 9, 9, 9, 9, 9, 10, 10, |
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10, 10, 11, 11, 11, 11, 12, 12, |
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12, 12, 12, 12, 12, 12, 7, |
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}; |
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typedef struct CLVContext { |
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AVCodecContext *avctx; |
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IDCTDSPContext idsp; |
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AVFrame *pic; |
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GetBitContext gb; |
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int mb_width, mb_height; |
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VLC dc_vlc, ac_vlc; |
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int luma_dc_quant, chroma_dc_quant, ac_quant; |
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DECLARE_ALIGNED(16, int16_t, block)[64]; |
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int top_dc[3], left_dc[4]; |
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int iframes_warning; |
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} CLVContext; |
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static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac, |
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int ac_quant) |
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{ |
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GetBitContext *gb = &ctx->gb; |
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int idx = 1, last = 0, val, skip; |
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memset(blk, 0, sizeof(*blk) * 64); |
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blk[0] = get_vlc2(gb, ctx->dc_vlc.table, 9, 3); |
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if (blk[0] < 0) |
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return AVERROR_INVALIDDATA; |
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blk[0] -= 63; |
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if (!has_ac) |
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return 0; |
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while (idx < 64 && !last) { |
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val = get_vlc2(gb, ctx->ac_vlc.table, 9, 2); |
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if (val < 0) |
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return AVERROR_INVALIDDATA; |
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if (val != 0x1BFF) { |
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last = val >> 12; |
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skip = (val >> 4) & 0xFF; |
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val &= 0xF; |
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if (get_bits1(gb)) |
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val = -val; |
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} else { |
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last = get_bits1(gb); |
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skip = get_bits(gb, 6); |
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val = get_sbits(gb, 8); |
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} |
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if (val) { |
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int aval = FFABS(val), sign = val < 0; |
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val = ac_quant * (2 * aval + 1); |
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if (!(ac_quant & 1)) |
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val--; |
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if (sign) |
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val = -val; |
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} |
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idx += skip; |
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if (idx >= 64) |
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return AVERROR_INVALIDDATA; |
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blk[ff_zigzag_direct[idx++]] = val; |
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} |
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return (idx <= 64 && last) ? 0 : -1; |
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} |
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#define DCT_TEMPLATE(blk, step, bias, shift, dshift, OP) \ |
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const int t0 = OP(2841 * blk[1 * step] + 565 * blk[7 * step]); \
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const int t1 = OP( 565 * blk[1 * step] - 2841 * blk[7 * step]); \
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const int t2 = OP(1609 * blk[5 * step] + 2408 * blk[3 * step]); \
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const int t3 = OP(2408 * blk[5 * step] - 1609 * blk[3 * step]); \
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const int t4 = OP(1108 * blk[2 * step] - 2676 * blk[6 * step]); \
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const int t5 = OP(2676 * blk[2 * step] + 1108 * blk[6 * step]); \
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const int t6 = ((blk[0 * step] + blk[4 * step]) << dshift) + bias; \
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const int t7 = ((blk[0 * step] - blk[4 * step]) << dshift) + bias; \
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const int t8 = t0 + t2; \
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const int t9 = t0 - t2; \
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const int tA = 181 * (t9 + (t1 - t3)) + 0x80 >> 8; \
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const int tB = 181 * (t9 - (t1 - t3)) + 0x80 >> 8; \
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const int tC = t1 + t3; \
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\
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blk[0 * step] = (t6 + t5 + t8) >> shift; \
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blk[1 * step] = (t7 + t4 + tA) >> shift; \
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blk[2 * step] = (t7 - t4 + tB) >> shift; \
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blk[3 * step] = (t6 - t5 + tC) >> shift; \
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blk[4 * step] = (t6 - t5 - tC) >> shift; \
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blk[5 * step] = (t7 - t4 - tB) >> shift; \
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blk[6 * step] = (t7 + t4 - tA) >> shift; \
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blk[7 * step] = (t6 + t5 - t8) >> shift; \
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#define ROP(x) x |
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#define COP(x) (((x) + 4) >> 3) |
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static void clv_dct(int16_t *block) |
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{ |
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int i; |
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int16_t *ptr; |
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ptr = block; |
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for (i = 0; i < 8; i++) { |
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DCT_TEMPLATE(ptr, 1, 0x80, 8, 11, ROP); |
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ptr += 8; |
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} |
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ptr = block; |
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for (i = 0; i < 8; i++) { |
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DCT_TEMPLATE(ptr, 8, 0x2000, 14, 8, COP); |
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ptr++; |
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} |
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} |
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static int decode_mb(CLVContext *c, int x, int y) |
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{ |
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int i, has_ac[6], off; |
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for (i = 0; i < 6; i++) |
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has_ac[i] = get_bits1(&c->gb); |
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off = x * 16 + y * 16 * c->pic->linesize[0]; |
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for (i = 0; i < 4; i++) { |
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if (decode_block(c, c->block, has_ac[i], c->ac_quant) < 0) |
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return AVERROR_INVALIDDATA; |
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if (!x && !(i & 1)) { |
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c->block[0] += c->top_dc[0]; |
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c->top_dc[0] = c->block[0]; |
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} else { |
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c->block[0] += c->left_dc[(i & 2) >> 1]; |
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} |
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c->left_dc[(i & 2) >> 1] = c->block[0]; |
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c->block[0] *= c->luma_dc_quant; |
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clv_dct(c->block); |
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if (i == 2) |
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off += c->pic->linesize[0] * 8; |
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c->idsp.put_pixels_clamped(c->block, |
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c->pic->data[0] + off + (i & 1) * 8, |
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c->pic->linesize[0]); |
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} |
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off = x * 8 + y * 8 * c->pic->linesize[1]; |
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for (i = 1; i < 3; i++) { |
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if (decode_block(c, c->block, has_ac[i + 3], c->ac_quant) < 0) |
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return AVERROR_INVALIDDATA; |
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if (!x) { |
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c->block[0] += c->top_dc[i]; |
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c->top_dc[i] = c->block[0]; |
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} else { |
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c->block[0] += c->left_dc[i + 1]; |
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} |
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c->left_dc[i + 1] = c->block[0]; |
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c->block[0] *= c->chroma_dc_quant; |
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clv_dct(c->block); |
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c->idsp.put_pixels_clamped(c->block, c->pic->data[i] + off, |
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c->pic->linesize[i]); |
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} |
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return 0; |
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} |
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static int clv_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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CLVContext *c = avctx->priv_data; |
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GetByteContext gb; |
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uint32_t frame_type; |
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int i, j, ret; |
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bytestream2_init(&gb, buf, buf_size); |
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if (avctx->codec_tag == MKTAG('C', 'L', 'V', '1')) { |
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int skip = bytestream2_get_byte(&gb); |
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bytestream2_skip(&gb, (skip + 1) * 8); |
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} |
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frame_type = bytestream2_get_byte(&gb); |
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if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) |
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return ret; |
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c->pic->key_frame = frame_type & 0x20 ? 1 : 0; |
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c->pic->pict_type = frame_type & 0x20 ? AV_PICTURE_TYPE_I |
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: AV_PICTURE_TYPE_P; |
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if (frame_type & 0x2) { |
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bytestream2_get_be32(&gb); // frame size;
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c->ac_quant = bytestream2_get_byte(&gb); |
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c->luma_dc_quant = 32; |
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c->chroma_dc_quant = 32; |
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if ((ret = init_get_bits8(&c->gb, buf + bytestream2_tell(&gb), |
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buf_size - bytestream2_tell(&gb))) < 0) |
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return ret; |
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for (i = 0; i < 3; i++) |
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c->top_dc[i] = 32; |
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for (i = 0; i < 4; i++) |
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c->left_dc[i] = 32; |
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for (j = 0; j < c->mb_height; j++) { |
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for (i = 0; i < c->mb_width; i++) { |
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ret |= decode_mb(c, i, j); |
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} |
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} |
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} else { |
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if (!c->iframes_warning) |
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avpriv_report_missing_feature(avctx, "Non-I-frames in Clearvideo"); |
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c->iframes_warning = 1; |
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return AVERROR_PATCHWELCOME; |
||||||
|
} |
||||||
|
|
||||||
|
if ((ret = av_frame_ref(data, c->pic)) < 0) |
||||||
|
return ret; |
||||||
|
|
||||||
|
*got_frame = 1; |
||||||
|
|
||||||
|
return ret < 0 ? ret : buf_size; |
||||||
|
} |
||||||
|
|
||||||
|
static av_cold int clv_decode_init(AVCodecContext *avctx) |
||||||
|
{ |
||||||
|
CLVContext *const c = avctx->priv_data; |
||||||
|
int ret; |
||||||
|
|
||||||
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
||||||
|
|
||||||
|
c->avctx = avctx; |
||||||
|
c->mb_width = FFALIGN(avctx->width, 16) >> 4; |
||||||
|
c->mb_height = FFALIGN(avctx->height, 16) >> 4; |
||||||
|
c->iframes_warning = 0; |
||||||
|
c->pic = av_frame_alloc(); |
||||||
|
if (!c->pic) |
||||||
|
return AVERROR(ENOMEM); |
||||||
|
|
||||||
|
ff_idctdsp_init(&c->idsp, avctx); |
||||||
|
ret = init_vlc(&c->dc_vlc, 9, NUM_DC_CODES, |
||||||
|
clv_dc_bits, 1, 1, |
||||||
|
clv_dc_codes, 1, 1, 0); |
||||||
|
if (ret) { |
||||||
|
av_log(avctx, AV_LOG_ERROR, "Error initialising DC VLC\n"); |
||||||
|
return ret; |
||||||
|
} |
||||||
|
ret = ff_init_vlc_sparse(&c->ac_vlc, 9, NUM_AC_CODES, |
||||||
|
clv_ac_bits, 1, 1, |
||||||
|
clv_ac_codes, 1, 1, |
||||||
|
clv_ac_syms, 2, 2, 0); |
||||||
|
if (ret) { |
||||||
|
av_log(avctx, AV_LOG_ERROR, "Error initialising AC VLC\n"); |
||||||
|
return ret; |
||||||
|
} |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
static av_cold int clv_decode_end(AVCodecContext *avctx) |
||||||
|
{ |
||||||
|
CLVContext *const c = avctx->priv_data; |
||||||
|
|
||||||
|
av_frame_free(&c->pic); |
||||||
|
|
||||||
|
ff_free_vlc(&c->dc_vlc); |
||||||
|
ff_free_vlc(&c->ac_vlc); |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
AVCodec ff_clearvideo_decoder = { |
||||||
|
.name = "clearvideo", |
||||||
|
.long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"), |
||||||
|
.type = AVMEDIA_TYPE_VIDEO, |
||||||
|
.id = AV_CODEC_ID_CLEARVIDEO, |
||||||
|
.priv_data_size = sizeof(CLVContext), |
||||||
|
.init = clv_decode_init, |
||||||
|
.close = clv_decode_end, |
||||||
|
.decode = clv_decode_frame, |
||||||
|
.capabilities = AV_CODEC_CAP_DR1, |
||||||
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, |
||||||
|
}; |
||||||
Loading…
Reference in new issue